<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>ES-7 feature</title>
</head>
<body>
  <script>
    // includes   indexOF
    const mingzhu = ['西游记','红楼梦','三国演义','水浒传'];

    // 判断
    // console.log(mingzhu.includes('西游记'));
    // console.log(mingzhu.includes('金瓶梅'));

    // **
    console.log(2 ** 10);         // 1024
    console.log(Math.pow(2, 10)); // 1024
  </script>
</body>
</html>